the reason why 和the reason is that 的区别在哪,他们引导的从句是不是都不缺成分

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the reason why 和the reason is that 的区别在哪,他们引导的从句是不是都不缺成分

the reason why…是由why引导定于状语从句,在句中作引导词,不能省略.例:The reason why some people ask is that they have questions.(人们问的理由是他们有疑惑.)
the reason is that 是由that 引导的表语从句,that位于be动词之后,也做引导词,不能省略.例:The reason is that he has had a headeache.(原因是他头痛.)